The only original building left intact at Sutter's Fort is getting an upgrade.For the past month, California State Parks employees have been working to seismically stabilize and reshingle the roof of the historic Central Building at Sutter's Fort Historic Park.When originally constructed in 1840, the 6,500-square-foot building was the largest in the region, and it has since served alternatively as an office space, an entertainment hub, an Army headquarters and a miners dormitory....